"Si demain... (Turn Around)" is a 2003 bilingual song recorded by Bonnie Tyler and Kareen Antonn, composed by Jim Steinman and re-written in French by Emmanuel Pribys. As the lead single from Tyler's album Simply Believe, the song became a huge hit in France, where it topped the chart for three months, and in other French-speaking European countries. It also helped launch the career of French singer Kareen Antonn. The music video finds Tyler taking Antonn in after a breakup.

The song was well received by music critics, who regarded the success of the single as Bonnie Tyler's comeback. "Si demain... (Turn Around)" was certified Platinum in France and Belgium in 2004.

Bonnie Tyler had a hit with "Total Eclipse of the Heart" in 1984. In 2003, Kareen Antonn wrote to Tyler asking if she would be willing to record a French-English duet version of the song that was re-arranged by Antonn's friend Emmanuel Pribys. Tyler's initial reaction was to decline the request because Antonn was an unknown artist, "but they didn't give up," Tyler continued, "they sent me a CD of her voice singing the song in French. I always listen to things because you never know!" Tyler was impressed by the demo recording, and asked to sing the song live with her to ensure that her voice was strong enough and not reliant on studio editing.

Tyler flew to Paris and recorded the song with Antonn in just a couple of hours. Their demo recording was sent to various French radio stations. She explained to BBC News that the single was released three weeks earlier than planned "after people heard it on the radio and went into the shops trying to buy it." "Si demain... (Turn Around)" was released in France on 19 December 2003, and a few weeks later in Belgium and Switzerland, and later included on her 2004 album Simply Believe and Antonn's self-titled solo album as well as several 2004 compilation albums such as Le Meilleur des Voix,NRJ Hit Music Only,Fan 2,Girls 2004, and Duets.

After the unexpected success of the single, Antonn and Tyler decided to release another duet that they recorded; "Si tout s'arrête (It's a Heartache)" was released on 7 June 2004 but did not have the same success and peaked at number 12 on the week of its debut on the French SNEP Singles Chart. The song reached number 25 in Switzerland on 27 June 2004 and number seven in Belgium (Wallonia) on 3 July 2004.

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